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Thawt certificate issue with TMG web listner

Question

I have just bought new ssl certificate for ssl.xxx.x domain from thawt. We already have ssl certificate installed at TMG server which is running fine and going to expire on 15/1/13

I have installed the new certificate on windows 2008 R2 (SP1). But when I go to web listener and select certificate the certificate is marked red and its validity is invalid and I found the following error in the below box

This is Bryan from Thawte Tech Support. If you ran the certutil command and it resulted successfully, it means you have paired the thumbprint to the private key and your certificate should be valid.

However, if you are unable to use the certificate, it's possible that some things maybe corrupted. In that case, you can create a new CSR and do a free replacement on Thawte's web site. You can log into your Thawte certificate center and do the
replacement from there. To log into Thawte's account, please follow this link:

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